In the experiment of measuring the electric power of the small bulb, when the sliding rheostat is adjusted so that the voltage at both ends of the small bulb is higher than 1 / 5 of the rated voltage, the actual power of the small bulb is less than the rated power A. 6 / 5 times B.5 / 6 times C. 36 / 25 times d.4/50 times

c
Power refers to the work done by an object in unit time
p=u^2/r u1=6/5u2 p1=u1^2/r=(6/5u2)^2/r=36/25 p2

When doing the exploration experiment of "measuring the rated power of small light bulb", Xiaoming knows that the rated voltage of a small light bulb is 3V and the electric power is less than 1W (1). When connecting the circuit, some wires of Xiaoming are not connected, as shown in figure 15-15. Please use the stroke line as the wire, Help him to connect the circuit in the physical picture (the range of ammeter and voltmeter should be selected correctly); (2) Xiaoqiang in another experimental group finished connecting the circuit and closed the circuit switch. When he moved the slide of rheostat, he found that when the light bulb turned on, the voltage indication decreased, while when the light bulb turned dark, the voltage indication increased (the equipment was intact). Think about it, How can Xiaoqiang connect the circuit? Please draw the circuit connected by Xiaoqiang in the dotted box. (3) if Xiaoming carefully records the current and voltage values corresponding to the small bulb during the experiment, the recording table is as follows: from the data analysis in the table, it can be seen that in the process of gradually increasing the current through the filament, the resistance of the filament changes The rated power of the small bulb shall be w

The bulb is connected in series with the voltmeter, but the voltage can't increase when the bulb turns dark